1,551 research outputs found
Identification of Colour Reconnection using Factorial Correlator
A new signal is proposed for the colour reconnection in the hadronic decay of
W+ W- in e+e- collisions. Using Pythia Monte Carlo it is shown that this
signal, being based on the factorial correlator, is more sensitive than the
ones using only averaged quantities.Comment: 6 pages 1 postscript figur
Bis(2-chloro-1,10-phenanthroline-κ2 N,N′)(thioÂcyanato-κN)zinc (2-chloro-1,10-phenanthroline-κ2 N,N′)trisÂ(thioÂcyanato-κN)zincate
The asymmetric unit of the title compound, [Zn(NCS)(C12H7ClN2)2][Zn(NCS)3(C12H7ClN2)], contains two cations and two anions. In the cations, the ZnII ions have distorted trigonal–bipyramidal environments formed by four N atoms from two 2-chloro-1,10-phenanthroline (cphen) ligands and one N atom from a thioÂcyanate ligand. The ZnII atoms in the complex anions also have distorted trigonal–bipyramidal environments, formed by two N atoms from a cphen ligand and three N atoms from three thioÂcyanato ligands. The crystal packing exhibits π–π interÂactions between the rings of the cphen ligands [shortest centroid–centroid distance = 3.586 (5) Å] and short interÂmolecular S⋯Cl [3.395 (5) Å] and S⋯S [3.440 (4) Å] contacts
PHL 6625: A Minor Merger-Associated QSO Behind NGC 247
PHL 6625 is a luminous quasi-stellar object (QSO) at z = 0.3954 located
behind the nearby galaxy NGC 247 (z = 0.0005). Hubble Space Telescope (HST)
observations revealed an arc structure associated with it. We report on
spectroscopic observations with the Very Large Telescope (VLT) and
multiwavelength observations from the radio to the X-ray band for the system,
suggesting that PHL 6625 and the arc are a close pair of merging galaxies,
instead of a strong gravitational lens system. The QSO host galaxy is estimated
to be (4-28) x 10^10 M_sun, and the mass of the companion galaxy of is
estimated to be M_* = (6.8 +/- 2.4) x 10^9 M_sun, suggesting that this is a
minor merger system. The QSO displays typical broad emission lines, from which
a black hole mass of about (2-5) x 10^8 M_sun and an Eddington ratio of about
0.01-0.05 can be inferred. The system represents an interesting and rare case
where a QSO is associated with an ongoing minor merger, analogous to Arp 142.Comment: ApJ to appea
Privacy-Preserving Quantum Two-Party Geometric Intersection
Privacy-preserving computational geometry is the research area on the
intersection of the domains of secure multi-party computation (SMC) and
computational geometry. As an important field, the privacy-preserving geometric
intersection (PGI) problem is when each of the multiple parties has a private
geometric graph and seeks to determine whether their graphs intersect or not
without revealing their private information. In this study, through
representing Alice's (Bob's) private geometric graph G_A (G_B) as the set of
numbered grids S_A (S_B), an efficient privacy-preserving quantum two-party
geometric intersection (PQGI) protocol is proposed. In the protocol, the oracle
operation O_A (O_B) is firstly utilized to encode the private elements of
S_A=(a_0, a_1, ..., a_(M-1)) (S_B=(b_0, b_1, ..., b_(N-1))) into the quantum
states, and then the oracle operation O_f is applied to obtain a new quantum
state which includes the XOR results between each element of S_A and S_B.
Finally, the quantum counting is introduced to get the amount (t) of the states
|a_i+b_j> equaling to |0>, and the intersection result can be obtained by
judging t>0 or not. Compared with classical PGI protocols, our proposed
protocol not only has higher security, but also holds lower communication
complexity
Poly[diaquabisÂ(μ4-fumarato-κ4 O 1:O 1′:O 4:O 4′)(μ4-fumarato-κ6 O 1:O 1,O 1′:O 4:O 4,O 4′)(μ2-fumaric acid-κ2 O 1:O 4)dipraseodymium(III)]
The title complex, [Pr2(C4H2O4)3(C4H4O4)(H2O)2]n, was synthesized by reaction of praseodymium(III) nitrate hexaÂhydrate with fumaric acid in a water–ethanol (4:1) solution. The asymmetric unit comprises a Pr3+ cation, one and a half fumarate dianions (L
2−), one half-molÂecule of fumaric acid (H2L) and one coordinated water molÂecule. The carboxylÂate groups of the fumarate dianion and fumaric acid exhibit different coordination modes. In one fumarate dianion, two carboxylÂate groups are chelating with two Pr3+ cations, and the other two O atoms each coordinate a Pr3+ cation. Each O atom of the second fumarate dianion binds to a different Pr3+ cation. The fumaric acid employs one O atom at each end to bridge two Pr3+ cations. The Pr3+ cation is coordinated in a distorted tricapped trigonal–prismatic environment by eight O atoms of fumarate dianion or fumaric acid ligands and one water O atom. The PrO9 coordination polyhedra are edge-shared through one carboxylÂate O atom and two carboxylÂate groups, generating infinite praseodymium–oxygen chains, which are further connected by the ligands into a three-dimensional framework. The crystal structure is stabilized by O—H⋯O hydrogen-bond interÂactions between the coordinÂated water molÂecule and the carboxylÂate O atoms
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